user
Instruction:Explain what kind of email it is.

Input: Subject: You just received a credit of $75
Sender: offers@amazon.com
Content:
Hello XXX,

You just received a $75 credit to your Amazon account.

This is a reward for being an Amazon Prime customer. You can use this credit to purchase any item on Amazon. 

To use this credit, visit your account and use the code: XXX

Thanks,
The Amazon Team


assistant
This is a promotional email offering a customer reward for being an Amazon Prime customer. It provides a credit of $75 to be used on Amazon.com. The customer can use the code provided to get the credit applied to their account.